@Z-enzyme I think that checkbox just builds the adjacency indices needed for tessellation, which I don’t think I can easily use for the normal/tangents, so the SMC probably wouldn’t gain you anything. I should be able to split the normal/tangent calculation apart so that the 2 parts can be operated separately (initial adjacency calculation, or you create the info yourself) then the simpler calculator you just feed it the stored adjacency. that should help substantially in the cases where you need to recalculate normals/tangents for a specific topology that only changed positions.
You got an interesting project there btw! I don’t use blueprints much except for setting configuration and tiny little things. My system is full C++, so not sure what to tell you which making that faster in BP other than make sure to use Nativize if it works for you.